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    Subject[PATCH 19/26] cgroup/misc: Expose parent_misc()
    Date
    To manage the SGX EPC memory via the misc controller, the SGX
    driver will need to be able to iterate over the misc cgroup
    hierarchy. Make parent_misc() available for a future patch
    that will utilize it.

    Signed-off-by: Kristen Carlson Accardi <kristen@linux.intel.com>
    ---
    include/linux/misc_cgroup.h | 6 ++++++
    kernel/cgroup/misc.c | 3 ++-
    2 files changed, 8 insertions(+), 1 deletion(-)

    diff --git a/include/linux/misc_cgroup.h b/include/linux/misc_cgroup.h
    index b79c78378f17..d1aeb85f2ed6 100644
    --- a/include/linux/misc_cgroup.h
    +++ b/include/linux/misc_cgroup.h
    @@ -60,6 +60,7 @@ struct misc_cg {
    };

    struct misc_cg *root_misc(void);
    +struct misc_cg *parent_misc(struct misc_cg *cg);
    unsigned long misc_cg_res_total_usage(enum misc_res_type type);
    int misc_cg_set_capacity(enum misc_res_type type, unsigned long capacity);
    int misc_cg_try_charge(enum misc_res_type type, struct misc_cg *cg,
    @@ -112,6 +113,11 @@ static inline struct misc_cg *root_misc(void)
    return NULL;
    }

    +static inline struct misc_cg *parent_misc(struct misc_cg *cg)
    +{
    + return NULL;
    +}
    +
    static inline unsigned long misc_cg_res_total_usage(enum misc_res_type type)
    {
    return 0;
    diff --git a/kernel/cgroup/misc.c b/kernel/cgroup/misc.c
    index 8aa994d9cd02..b22a055af9ad 100644
    --- a/kernel/cgroup/misc.c
    +++ b/kernel/cgroup/misc.c
    @@ -63,10 +63,11 @@ EXPORT_SYMBOL_GPL(root_misc);
    * * struct misc_cg* - Parent of the @cgroup.
    * * %NULL - If @cgroup is null or the passed cgroup does not have a parent.
    */
    -static struct misc_cg *parent_misc(struct misc_cg *cgroup)
    +struct misc_cg *parent_misc(struct misc_cg *cgroup)
    {
    return cgroup ? css_misc(cgroup->css.parent) : NULL;
    }
    +EXPORT_SYMBOL_GPL(parent_misc);

    /**
    * valid_type() - Check if @type is valid or not.
    --
    2.37.3
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